Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/879#issuecomment-118777744
I thought about how we could change it so that the Watermarks are
transmitted "in-band" with the stream records. This would require the
StreamRecordSerializer to handle different types of records (copy, deserialize,
serialize, etc.). For this, I would propose to remove knowledge about the
StreamRecord serializer from all layers except the StreamTask layer, because it
does not work like a normal TypeSerializer anymore.
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